<!doctype html>
<html id="level1" lang="INVALID">
  <head>
    <meta charset="utf8" />
    <script src="/axe.js"></script>
    <script src="../custom-source-serializer.js"></script>
  </head>
  <body>
    <iframe id="frame2-a" src="level2-a.html"></iframe>
    <iframe id="frame2-b" src="level2-b.html"></iframe>
  </body>
</html>
